why we need vod and aod to make stainless steel?
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PART 2 : BASIS FOR THE DEVELEPOMENT OF NEW TWCHNOLOGY A new technology should be able to use high carbon ferrochrome as the low carbon ferrochrome is very expensive and decarburize the bath at lower temperatures as higher temperatures may damage the refractory lining of the vessel. If carbon oxidatRead more
PART 2 : BASIS FOR THE DEVELEPOMENT OF NEW TWCHNOLOGY
- A new technology should be able to use high carbon ferrochrome as the low carbon ferrochrome is very expensive and decarburize the bath at lower temperatures as higher temperatures may damage the refractory lining of the vessel.
- If carbon oxidation has to take place at lower temperatures then the partial pressure of the carbon monoxide gas should be lowered.
- There are two ways of lowering the partial pressure of the carbon monoxide gas. Either introduce vacuum or introduce a mixture of argon and oxygen.
- The method using vacuum is called VOD and the process using a mixture of Argon and oxygen is called AOD.
See lessAOD: Argon Oxygen Decarburisation VOD: Vaccum Oxygen Decarburisation It is used for Decarburisation purpose as Stainless Steel contains very less carbon. AOD provides an economical way to produce stainless steel with a minimal loss of precious elements. It is part of a duplex process in which scrapRead more
AOD: Argon Oxygen Decarburisation
VOD: Vaccum Oxygen Decarburisation
It is used for Decarburisation purpose as Stainless Steel contains very less carbon.
AOD provides an economical way to produce stainless steel with a minimal loss of precious elements. It is part of a duplex process in which scrap or virgin raw materials are first melted in an electric arc furnace (EAF) or induction furnace. The molten metal is then decarburized and refined in a special AOD vessel to less than 0.05% carbon. The key feature in the AOD vessel is that oxygen for decarburization is mixed with argon or nitrogen inert gases and injected through submerged tuyeres. This argon dilution minimizes unwanted oxidation of precious elements contained in specialty steels, such as chromium.
See lessARGON OXYGEN DECARBURIZATION
ARGON OXYGEN DECARBURIZATION
See lessVACUUM OXYGEN DECARBURIZATION
VACUUM OXYGEN DECARBURIZATION
See lessPART 1 : TECHNOLOGY OF STAINLESS STEEL MAKING Electric arc furnace were used to produce stainless steel of the desired composition. EAF was only used as a melting unit. Typically the charge consisted of carbon steel scrap, stainless steel scrap and lime. The charge is melted in an EAF and after theRead more
PART 1 : TECHNOLOGY OF STAINLESS STEEL MAKING
See lessElectric arc furnace were used to produce stainless steel of the desired composition. EAF was only used as a melting unit.
Typically the charge consisted of carbon steel scrap, stainless steel scrap and lime. The charge is melted in an EAF and after the meltdown period the melt contain a Fe-Cr-Ni-C alloy.
Oxygen is blown into the melt and basic Cr2O3 slag forms. Initially the Chromium oxidizes until the bath temperature reaches about 1800 degrees. Carbon oxidation occurs once the temperature rises to 1800 degrees towards the finishing stages. Low carbon Ferro chrome is added to make up the chromium content of the steel.
But this process has some disadvantages like,
1. High temperatures are required which may cause damage to the refractory lining.
2. Low carbon ferrochrome is used, which is expensive.